<!DOCTYPE html>
<html lang="en">

   <head>
      <meta charset="UTF-8"/>
      <meta http-equiv="X-UA-Compatible" content="IE=edge"/>
      <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
      <title>tab栏切换</title>
      <style>
          * {
              margin: 0;
              padding: 0;
          }

          .tab {
              width: 590px;
              height: 340px;
              margin: 20px;
              border: 1px solid #e4e4e4;
          }

          .tab-nav {
              width: 100%;
              height: 60px;
              line-height: 60px;
              display: flex;
              justify-content: space-between;
          }

          .tab-nav h3 {
              font-size: 24px;
              font-weight: normal;
              margin-left: 20px;
          }

          .tab-nav ul {
              list-style: none;
              display: flex;
              justify-content: flex-end;
          }

          .tab-nav ul li {
              margin: 0 20px;
              font-size: 14px;
          }

          .tab-nav ul li a {
              text-decoration: none;
              border-bottom: 2px solid transparent;
              color: #333;
          }

          .tab-nav ul li a.active {
              border-color: #e1251b;
              color: #e1251b;
          }

          .tab-content {
              padding: 0 16px;
          }

          .tab-content .item {
              display: none;
          }

          .tab-content .item.active {
              display: block;
          }
      </style>
   </head>

   <body>
      <div class="tab">
         <div class="tab-nav">
            <h3>每日特价</h3>
            <ul>
               <li><a class="active" href="javascript:;">精选</a></li>
               <li><a href="javascript:;">美食</a></li>
               <li><a href="javascript:;">百货</a></li>
               <li><a href="javascript:;">个护</a></li>
               <li><a href="javascript:;">预告</a></li>
            </ul>
         </div>
         <div class="tab-content">
            <div class="item active"><img src="./images/tab00.png" alt=""/></div>
            <div class="item"><img src="./images/tab01.png" alt=""/></div>
            <div class="item"><img src="./images/tab02.png" alt=""/></div>
            <div class="item"><img src="./images/tab03.png" alt=""/></div>
            <div class="item"><img src="./images/tab04.png" alt=""/></div>
         </div>
      </div>
      <script>
         let lis = document.querySelectorAll('.tab-nav ul a')
         console.log(lis)
         for (let i = 0; i < lis.length; i++) {
            lis[i].addEventListener('mouseenter', function () {
               // 删除之前的属性
               document.querySelector('.tab-nav .active').classList.remove('active')
               // document.querySelector('.tab-nav li a:nth-child(${i+1})').classList.add('active')
               this.classList.add('active')

               document.querySelector('.tab-content .active').classList.remove('active')
               document.querySelector(`.tab-content .item:nth-child(${i + 1})`).classList.add('active')
            })
         }
      </script>
   </body>

</html>